Extra exam question E6F03
Subelement E6, CIRCUIT COMPONENTS· Group E6F
What is the most common configuration of an optoisolator or optocoupler?
- A.A lens and a photomultiplier
- B.A frequency-modulated helium-neon laser
- C.An amplitude-modulated helium-neon laser
- D.An LED and a phototransistor (correct answer)
WhyThe most common configuration of an optoisolator or optocoupler is an LED paired with a phototransistor. The most common optoisolator or optocoupler configuration pairs an LED with a phototransistor inside a single small package, the LED converts an electrical signal to light and the phototransistor converts that light back to an electrical signal on the other side, providing electrical isolation between the two circuits, answer D. Photomultipliers and helium-neon lasers are far more elaborate, specialized optical devices, not what's used in an ordinary, everyday optoisolator.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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